Removing AdminBar in Buddypress Social Theme

Hello, I am trying to remove the adminbar from my Buddypress Social Theme running on the latest versions for WPMU and BP.

I have tried using the method of:
<?php define('BP_DISABLE_ADMIN_BAR', true); ?>
Which I placed into my Mu Plugins folder.

I go back to the homepage, adminbar is gone. But in the footer, I see
Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'bp_core_admin_bar' was given in /public_html/wp-includes/plugin.php on line 339

There must be flawless a way to get rid of the adminbar. Any suggestions?